VALVE TIMING
Inlet valve timing
Inlet valve opens 32° before top dead centre.
Inlet valve closes 63° after bottom dead centre.
Exhaust valve timing
Exhaust valve opens 65° before bottom dead centre.
Exhaust valve closes 30° after top dead centre.
(See page 92 for particulars of special timing disc graduated in degrees.)
Illustration 11
Inlet Camshaft timing marks
(Use mark "2")
When checking the valve timing the tappet clearances must be set to ·016 inch so that
the tappets may be well clear of the quietening curves of the camshafts.
The timing gears are marked to facilitate their replacement.
To re-set the valve timing, by using the marks on the gears, proceed as
follows :—
Turn over the engine till the mark on the small timing pinion (D in Illustration 11) is
in line with the centre of the inlet (rear) camshaft bush. Insert the inlet camshaft so
that the No. 2 mark on it is in mesh with the mark on the small timing pinion (D).
Rotate the engine in a forward direction till the mark on the small timing pinion (D
in Illustration 12) is in line with the centre of the exhaust (front) camshaft bush. Insert
the exhaust camshaft so that the No. 2 mark on it is in mesh with the mark on the small
timing pinion (D).
Illustration 12
Exhaust Camshaft timing
marks
(Use mark "2")
E—A
33
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